Investments (Available-for-Sale) (Details) - USD ($) $ in Thousands	Oct. 02, 2016	Apr. 03, 2016
Total available-for-sale investments
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 318,488	$ 275,629
Gross Unrealized Gains	424	409
Gross Unrealized Losses	(235)	(187)
Estimated Fair Value	318,677	275,851
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	62,660	32,374
Gross Unrealized Gains	77	146
Gross Unrealized Losses	(34)	(1)
Estimated Fair Value	62,703	32,519
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	56,363	124,504
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	56,363	124,504
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	14,992	10,518
Gross Unrealized Gains	36	4
Gross Unrealized Losses	0	(7)
Estimated Fair Value	15,028	10,515
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	141,899	91,321
Gross Unrealized Gains	286	246
Gross Unrealized Losses	(128)	(179)
Estimated Fair Value	142,057	91,388
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	4,845	2,195
Gross Unrealized Gains	25	13
Gross Unrealized Losses	0	0
Estimated Fair Value	4,870	2,208
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	25,014	1,992
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(73)	0
Estimated Fair Value	24,941	1,992
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	11,767	11,711
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	11,767	11,711
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	48	114
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	48	114
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	900	900
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	900	900
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	58,315	124,618
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	58,315	124,618
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	260,173	151,011
Gross Unrealized Gains	424	409
Gross Unrealized Losses	(235)	(187)
Estimated Fair Value	$ 260,362	$ 151,233

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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